Neutron Activation at 195 kev

Lyon, W. S.; Macklin, R. L.

doi:10.1103/physrev.114.1619

Cited by 77 publications

(13 citation statements)

References 6 publications

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“…They were obtained by repeating the calculations using the upper and lower limits of the s-wave radiation width and level spacing, respectively. Our calculated results are compared to available experimental data from the EXFOR/CSISRS database [27,28,29,30,31,32,33,34,35] and we find a satisfactory agreement for the isotopes that are well studied and are characterized by high level densities, which implies that the statistical-reaction treatment is well justified. However, the resonance spacing in 91 Zr is rather large and signatures of individual peaks are observed in the 90 Zr(n, γ) 91 Zr experimental data which suggests that the statistical treatment might not be appropriate for this case.…”

Section: B Neutron Capture Cross Sections For Zr Isotopesmentioning

confidence: 58%

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Determining neutron capture cross sections via the surrogate reaction technique

et al. 2007

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Indirect methods play an important role in the determination of nuclear reaction cross sections that are hard to measure directly. In this paper we investigate the feasibility of using the so-called surrogate method to extract neutron-capture cross sections for low energy compound-nuclear reactions in spherical and near-spherical nuclei. We present the surrogate method and develop a statistical nuclear-reaction simulation to explore different approaches to utilize surrogate reaction data. We assess the success of each approach by comparing the extracted cross sections with a predetermined benchmark. In particular, we employ regional systematics of nuclear properties in the 34 ≤ Z ≤ 46 region to calculate (n, γ) cross sections for a series of Zr isotopes, and to simulate a surrogate experiment and the extraction of the desired cross section. We identify one particular approach that may provide very useful estimates of the cross section, and we discuss some of the limitations of the method. General recommendations for future (surrogate) experiments are also given.PACS numbers: 24.10. 24.60.Dr, 25.40.Lw, 98.80.Ft

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Section: B Neutron Capture Cross Sections For Zr Isotopesmentioning

confidence: 58%

“…90 Zr,91 Zr,92 Zr,93 Zr,94 Zr, and 95 Zr. Experimental data are from Refs [27,28,29,30,31,32,33,34,35]…”

mentioning

confidence: 99%

Determining neutron capture cross sections via the surrogate reaction technique

et al. 2007

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“…JENDL-4.0, JENDL-3.3, and ENDF/B-VII.0 used radiation widths measured by Brusegan et al 24) Since Brusegan's measurement determined the radiation widths are shown as solid circles. Previous measurements [14][15][16][17] and evaluated data of JENDL-4.0, JENDL-3.3, ENDF/B-VII.0, and ENDF/B-VI.8 are compared with the present data. ENDF/B-VII.0 adopted the evaluated data of JENDL-3.3 above 100 keV.…”

Section: Resultsmentioning

confidence: 99%

“…Lyon and Macklin performed an activation measurement at 195 keV using a RdTh-D 2 O neutron source. 17) Evaluations in JENDL-4.0, 18) JENDL-3.3, 19) ENDF/ B-VII.0, 20) and ENDF/B-VI.8 21) provided nuclear data as resonance parameters below 100 keV. The resonance parameters, however, have not been firmly determined, especially in the high-energy region.…”

Section: Articlementioning

confidence: 99%

Measurement of keV-Neutron Capture Cross Section of⁹⁶Zr

Katabuchi¹,

Igashira²,

Kiyanagi³

2011

Journal of Nuclear Science and Technology

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The neutron capture cross section of 96 Zr at incident neutron energies from 15 to 100 keV has been measured by the time-of-flight method. Capture-rays were detected with an anti-Compton NaI(Tl) spectrometer, and the pulse-height weighting technique was applied to derive the neutron capture cross section. The present measurement provided the capture cross section as a function of incident neutron energy in the keV region. The results were compared with previous measurements and cross section data in the evaluated nuclear data libraries, JENDL-4.0, JENDL-3.3, ENDF/B-VII.0, and ENDF/B-VI.8. The present results revealed considerable underestimation of the evaluated cross sections in the high-energy region of 35-100 keV.

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“…5b. It is also obvious from Table I that in general, the standard 78 Se(n,γ), data from Ref. [107]; (d) 80 Se(n,γ), data from Refs.…”

Section: Microscopic Calculations Within the Quasi-particlementioning

confidence: 90%

Uncertainties in radiative neutron-capture rates relevant to the $A\sim 80$ $r$-process peak

Kullmann¹,

Lima²,

Larsen³

et al. 2018

Preprint

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The rapid neutron-capture process (r-process) has for the first time been confirmed to take place in a neutronstar merger event. A detailed understanding of the rapid neutron-capture process is one of the holy grails in nuclear astrophysics. In this work we investigate one aspect of the r-process modelling: uncertainties in radiative neutron-capture cross sections and astrophysical reaction rates for isotopes of the elements Fe, Co, Ni, Cu, Zn, Ga, Ge, As, and Se. In particular, we study deviations from standard libraries used for astrophysics, and the influence of a very-low γ-energy enhancement in the average, reduced γ-decay probability on the (n, γ) rates. We find that the intrinsic uncertainties are in some cases extremely large, and that the low-energy enhancement, if present in neutron-rich nuclei, may increase the neutron-capture reaction rate significantly.

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Neutron Activation at 195 kev

Cited by 77 publications

References 6 publications

Determining neutron capture cross sections via the surrogate reaction technique

Determining neutron capture cross sections via the surrogate reaction technique

Measurement of keV-Neutron Capture Cross Section of⁹⁶Zr

Uncertainties in radiative neutron-capture rates relevant to the $A\sim 80$ $r$-process peak

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Neutron Activation at 195 kev

Cited by 77 publications

References 6 publications

Determining neutron capture cross sections via the surrogate reaction technique

Determining neutron capture cross sections via the surrogate reaction technique

Measurement of keV-Neutron Capture Cross Section of96Zr

Uncertainties in radiative neutron-capture rates relevant to the $A\sim 80$ $r$-process peak

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Measurement of keV-Neutron Capture Cross Section of⁹⁶Zr